RGB LED Cluster Driver Data sheet

Transcription

1 RGB LED Cluster Driver Data sheet 2013/12/17 3 channel 16 bit PWM Constant Current Driver Features 3 adjustable constant current sink channel 16 bit high resolution PWM output Built-in 60MHz PWM oscillator Non-scrambled 910Hz PWM refresh rate 3mA ~ 200mA channel driving capability 0.8V (200mA/channel) low output voltage dropout Picture motion blur elimination talent 2 or 3 wire data transmission technology Maximum 8MHz serial in clock frequency 3V ~ 24V wide range power supply voltage 0V ~ 26V output channel sustain voltage Automatic power down function Built-in 20mA/5V voltage output 160 junction temperature thermal shutdown Less than 0.5%/10 thermal regulation Less than 5% chip current skew Less than 3% channel to channel current skew Less than 1%/V line regulation Less than 1%/V load regulation Green package Applications Outdoor/Indoor LED mesh display General LED Lighting Decoration lighting for architecture Landscape lighting Ground / Wall indicator Ambient Lighting High speed PWM generator Package Type & Part No. Part No. SS Protection 8KV ESD protection circuit Package type SSOP 150 mil 16 pin Product Description is a high performance PWM-embedded 3 channel constant current LED driver with high speed, high grey level resolution, high current linearity, high driving capability and wide supply voltage range. It incorporates shift registers and data latches for control data transmission in cascade pixel or light source system. All these special characteristics make very suitable for wide area LED display and various lighting applications. For the display application, the current of LED can be driven precisely by embedded 16 bit PWM controller. That can keep picture clear when the brightness is quite low. In contrast to scrambled PWM output, the 910 Hz non-scrambled PWM output of not only keeps the high refresh rate but also minimizes the EMI generation and current distortion while output is switching. Furthermore, supports easy 2-wire data transmission interface that can reduce the firmware complexity, lower the BOM cost and enhance system reliability. A special picture motion blur eliminating function (patent granted) is provided by. Whenever the content of display updated, the data latch action will temporary disable all output channel. The special innovative design will naturally eliminate the visual staying phenomenon for fast moving object on screen. For the lighting application, each output channel can drive current up to 200mA. Therefore, in a 24V power system, maximum about 13 watt LEDs can be driven by a single. To keep output constant, at least 0.8V operation voltage drop in current path is required. adopts in path resistor structure to control the output current. The portion of voltage drop on is 0.5V and the other 0.3V drop is on external in path current setting resistor. The in path resistor structure will lower the heat generation from and let the lighting system more reliable. In order to cooperate with other wise controller such as MCU or some peripheral devices, can provide a 5V voltage source. For some special stand alone systems, this feature can simplify the power regulation circuit, reduce the size of system and greatly expand the flexibility of system integration Ver.01.7

2 Pin Configuration & Terminal Description Pin # Pin name Function 1 Ground 2 R0 Channel 0 current set resistor 3 R1 Channel 1 current set resistor 4 R2 Channel 2 current set resistor 5 Ground 6 LEO Latch enable output 7 SDO Serial data output 8 CKO Clock output 9 CKI Clock input 10 SDI Serial data input 11 LEI Latch enable input 12 V5 5V power supply output 13 OUT2 Output channel 2 14 OUT1 Output channel 1 15 OUT0 Output channel 0 16 VDD Power supply Block Diagram V5 OUT0 R0 OUT1 R1 OUT2 R2 VDD 5V voltage regulator Internal 5V power Bandgap reference 3 constant current output channel 60Mhz oscillator Internal /OE signal 16 bit counter 3 x 16 bits PWM generator Internal latch generator LEI 3 x 16 bits latch LEO CKI CKO SDI 3 x16 bits shift register SDO D A Ver.01.7

3 Equivalent Circuits for Inputs and Output Clock terminal Latch Enable terminal Serial Data Input terminal Serial Data / Latch Enable / Clock Output terminal Output / R EXT terminal VLED OUT0 OUT1 OUT2 Reference Voltage Control circuit R0 R1 R2 R ext0 R ext1 R ext2-3 - Ver.01.7

4 Maximum Ratings (T = 25 C) Characteristic Symbol Rating Unit Supply voltage V DD 0 ~ 24 V Output channel voltage V OUT -0.2 ~ 28 V Output current per channel I OUT 3 ~ 250 ma Input voltage (Digital I/O) V OE -0.2 ~ V DD V Output voltage (Digital I/O) V DIO 0V / 5V V SOP 0.86 Power Dissipation (On PCB) Thermal Resistance P D R TH(j-a) SSOP 0.82 W QFN 2.0 SOP SSOP C /W QFN Operating temperature T OPR -40 ~ +85 C Storage temperature T STG -55 ~ +150 C Test Circuit VDD VL RL0 RL1 RL2 R0 R1 R R0 R1 R2 LEO SDO CKO VDD OUT0 OUT1 OUT2 V5 LEI SDI CKI C0 C1 C2 10pF 10pF 10pF C3 0.1uF Ver.01.7

5 Electrical Characteristics and Recommended Operating Conditions Characteristic Symbol Condition Min. Typ. Max. Unit Supply voltage V DD Room Temp V Supply current Output drop out voltage I DD V DD = 5V ma I DD V OUT All PWM output off (Power down mode) ua V DD = 5V, I OUT = 20mA V V DD = 5V, I OUT = 80mA V V DD = 5V, I OUT = 200mA V Output current I OUT ma Output breakdown voltage V OUT V R EXT Output voltage V Rext V DD > 3V V Bit current skew di OUT1 I OUT = 150mA, V OUT = 1 V - ±1 ±3 % Chip current skew di OUT2 I OUT = 150mA, V OUT = 1 V - - ±5 % Leakage I Leakage V OUT = 24V ua Clock Frequency F CLK V DD >= 5V, 40% < Duty < 60% MHz 5V voltage regulator I/O Input voltage I/O output voltage V5 V DD >= 5.2V, I v5 = 0mA V < V DD < 5.2V, I v5 = 0mA V DD V DD I v5out V DD > 5V, V5 > 4V ma V IH V DD >= 5V V IL V DD >= 5V V OH I/O current = -5mA V OL I/O current = 5mA Pull up resistor (Clock) R PU Pull down resistor (OE) R PD Output Line regulation %/V DD 3V < V DD < 24V I%/V Output Load regulation %/V OUT 0.6V < V OUT < 8V I%/V Output Thermal regulation %/10 C 3V < V DD < 24V I%/10 C Operating Temperature T OPR Ambient temperature C Junction Temperature Thermal Shutdown T Shut All output off C V V V KΩ Switching Characteristics (T = 25 C) Characteristic Symbol Condition Min. Typ. Max. Unit Propagation Delay ( L to H ) Propagation Delay ( H to L ) LE - OUTn t plh CKO - SDO t plh LEI LEO t plh CKI - CKO t plh LE - OUTn t phl CKO - SDO t phl Ver.01.7 ns

6 LEI LEO t phl3 V DD >= 5V V L = 5V CKI - CKO t phl V IH = V DD CLK (Clock High) us V IL = CLK (Clock Low) t w(clk) R EXT = 2.5Ω ns Pulse Width CLK (LATCH) R L = 30Ω us LE t C 0 = C 1 = C 2 = 10 pf w(le) ns C = 0.1uF CKO T CKO(Min) ns Temp. = 25 C Maximum Clock Frequency F CLKMAX MHz Clock Latch Hold time t h(clk) us Setup time for LE t s(le) Hold time for LE t h(le) Setup time for SDI t s(sdi) Hold time for SDI t h(sdi) V OUT Rising Time (driver off) t or V OUT Falling Time (driver on) t of Internal OSC frequency F OSC MHz PWM frequency F PWM Hz Power Down Recovery Time T Wake From CLK rising edge ns ns Luminance Data Transmission 3 wire data transmission Output channel 2, bit 2 Output channel 0, bit 15 Data latch here 2 wire data transmission Data latch here When clock signal keep high for more than 600us, will generate an internal pseudo LE signal. That will trigger the data latch circuit to hold the luminance data Ver.01.7

7 Timing Waveform LE trigger data latch Clock trigger data latch Clock in - Clock out and Serial in - Serial out Propagation delay Ver.01.7

8 Latch in Latch out Propagation delay Output I/V curve I OUT (ma) V DD = 6V V OUT (V) Line regulation I OUT (ma) V OUT = 1V V DD (V) Automatic Power Down and Recovery The power down mode in is almost a silent function. That is, system doesn t need to do anything for this function at most time. If the system controller always updates all luminance data of whole system each time the screen updated, there is nothing should be care about. But if controller updates partial luminance data of whole system each time, a 5uS or longer leading clock pulse for first data bit should be implemented. This longer clock will compensate the wakeup time of those which is in power down mode. The will get into power down mode automatically when all-zero luminance data (Luminance data of three output channels are all zero) is set and leave this mode by triggering from next clock rising edge. Although the first clock rising will resume the internal shift register immediately, but there are about 4us wakeup time for CKO regeneration control circuit. Once the power mode activated, the I DD current will lower down at about 80uA for energy saving. This unique power down function can save the system power dynamically even when system is in working state Ver.01.7

9 Picture motion-blur elimination To eliminate the motion blur of moving picture on screen, the content on screen must be temporary shut off for a while when the content on screen is changed. In, the LE signal is equal to OE signal. When the new luminance data is latched by LE signal, this logic high LE (OE ) signal will shut off all output channel. The system controller can control the duration of LE (OE ) signal to obtain the desire time interval for the motion blur elimination. After the LE (OE ) signal is back to logic low, the new luminance data is updated and all outputs are back to work. The LE (OE ) signal is not only coming from the LE pin but also come from clock. When clock keeps logic high for more 600us, an internal LE signal will be generated. This internal LE signal has same effect like LE signal from external LE pin. Output Current Setting The output current of is set by an external resistor (R EXT ). The current of each output channel can be calculated by the equation following. Typical application circuit I OUTn R EXT n Ω I OUTn = R EXTn Ω VDD B LED G LED R LED V DD = 3 ~ 24V V OUTn = V DD - V LEDn P D I out0 *(V out0 0.38) + I out1 *(V out1 0.38) + I out2 *(V out2 0.38) Data in R0 R1 R R0 R1 R2 LEO SDO CKO VDD OUT0 OUT1 OUT2 V5 LEI SDI CKI Data out 0.1uF Application Note In order to keep each output current uniform, the routing path of Rext n on PCB should be taken care. Because the parasitic resistance on these routing paths will influence the channel output current. The path from R n terminal to Rext n of three channels should be kept the distance and width as same as possible. That will let the parasitic resistance of three channels are same. On the other side of three Rext n are connected together and link to the ground pins of. This ground net should be shorter and wider for higher current passing through and keep the voltage drop minimized that will greatly improve the current skew between s. There are two GROND pin within. Both pin should be connected together on PCB to keep function normal. For the sake of noise immunity on V DD pin, it is suggest that a 0.1uF capacitor is connected between V5 and pin. When using 2 wire transmission method, LE pin should be connected to pin or leave it floating. In order to minimize the heat generation from, the proper V DD voltage should be chosen carefully to keep V OUTn as low as possible when that output channel is turned on Ver.01.7

10 Package Dimensions SSOP16L 150 mil Ver.01.7

11 Restrictions on product use NUMEN Tech. reserves the right to update these specifications in the future. The information contained herein is subject to change without notice. NUMEN Technology will continually working to improve the quality and reliability of its products. Nevertheless, semiconductor device in general can malfunction or fail due to their inherent electrical sensitivity and vulnerability to physical stress. It is the responsibility of the buyer, when utilizing NUMEN products, to comply with the standards of safety in making a safe design for the entire system, and to avoid situations in which a malfunction or failure of such NUMEN products could cause loss of human life, bodily injury or damage to property. In developing your designs, please ensure that NUMEN products are used within specified operating ranges as set forth in the most recent NUMEN products specifications. The NUMEN products listed in this document are intended for usage in general electronics applications (lighting system, personal equipment, office equipment, measuring equipment, industrial robotics, domestic appliances, etc.). These NUMEN products are neither intended nor warranted for usage in equipment that requires extraordinarily high quality and/or reliability or a malfunction or failure of which may cause loss of human life or bodily injury ( Unintended Usage ). Unintended Usage include atomic energy control instruments, airplane or spaceship instruments, transportation instruments, traffic signal instruments, combustion control instruments, medical instruments, all types of safety devices, etc.. Unintended Usage of NUMEN products listed in this document shall be made at the customer s own risk Ver.01.7